toMD5

public String toMD5( String s )
    {
        try
        {
            MessageDigest mDigest = java.security.MessageDigest.getInstance( "MD5" );
            mDigest.digest( s.getBytes("UTF-8") );
            byte[] digest = mDigest.digest();

            StringBuilder str = new StringBuilder();
            for( byte b : digest ){
                String t = Integer.toHexString( 0xFF & b);
                while( t.length() < 2 )
                    t = "0" + t;
                str.append(t);
            }
            return str.toString();
        } catch (NoSuchAlgorithmException | UnsupportedEncodingException e) { }
        return null;
    }